The Nikkor-W (wide) 2.8cm is my favorite lens. I purchased it as substitute for the Leica Summaron 28/5.6 that's much more expensive, and the Leica Elmarit 28 ASPH that is larger. Mine is late production, 717xxx and deletes the red "C" (coated, as is also the case with Brian's). I don't use a filter, and have never seen any documentation that it came with any hood, but I don't find a hood to be necessary. The only issue I've had is that you need to remember to keep you finger out of the field of view: the lens is so small and the field of view so great...! As an editorial aside and as a M9 user, for me a Nikkor-P 10.5cm and a Nikkor-W 2.8cm with ltm to M adapters are all I ever use anymore!